summaryrefslogtreecommitdiff
path: root/misc.c
blob: c37122df79f02ce969ef67f2ddbe87dee67b2bed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
#include "stdafx.h"
#include "ttd.h"
#include "table/strings.h"
#include "map.h"
#include "vehicle.h"
#include "gfx.h"
#include "assert.h"
#include "saveload.h"
#include "network.h"
#include "network_data.h"
#include "network_server.h"
#include "engine.h"

extern void StartupEconomy();
extern void InitNewsItemStructs();

byte _name_array[512][32];

static inline uint32 ROR(uint32 x, int n)
{
	return (x >> n) + (x << ((sizeof(x)*8)-n));
}

/* XXX - Player-seeds don't seem to be used anymore.. which is a good thing
     so I just disabled them for now. If there are no problems, we can remove
     it completely! -- TrueLight */
#undef PLAYER_SEED_RANDOM

#ifdef RANDOM_DEBUG
#include "network_data.h"

uint32 DoRandom(uint line, char *file)
#else
uint32 Random()
#endif
{
#ifdef RANDOM_DEBUG
	if (_networking && (DEREF_CLIENT(0)->status != STATUS_INACTIVE || !_network_server))
		printf("Random [%d/%d] %s:%d\n",_frame_counter, _current_player, file, line);
#endif

#ifdef PLAYER_SEED_RANDOM
	if (_current_player>=MAX_PLAYERS || !_networking) {
		uint32 s = _random_seeds[0][0];
		uint32 t = _random_seeds[0][1];
		_random_seeds[0][0] = s + ROR(t ^ 0x1234567F, 7);
		return _random_seeds[0][1] = ROR(s, 3);
	} else {
		uint32 s = _player_seeds[_current_player][0];
		uint32 t = _player_seeds[_current_player][1];
		_player_seeds[_current_player][0] = s + ROR(t ^ 0x1234567F, 7);
		DEBUG(net, 1)("[NET-Seeds] Player seed called!");
		return _player_seeds[_current_player][1] = ROR(s, 3);
	}
#else
	uint32 s = _random_seeds[0][0];
	uint32 t = _random_seeds[0][1];
	_random_seeds[0][0] = s + ROR(t ^ 0x1234567F, 7);
	return _random_seeds[0][1] = ROR(s, 3);
#endif
}

#ifdef RANDOM_DEBUG
uint DoRandomRange(uint max, uint line, char *file)
{
	return (uint16)DoRandom(line, file) * max >> 16;
}
#else
uint RandomRange(uint max)
{
	return (uint16)Random() * max >> 16;
}
#endif

uint32 InteractiveRandom()
{
	uint32 t = _random_seeds[1][1];
	uint32 s = _random_seeds[1][0];
	_random_seeds[1][0] = s + ROR(t ^ 0x1234567F, 7);
	return _random_seeds[1][1] = ROR(s, 3);
}

uint InteractiveRandomRange(uint max)
{
	return (uint16)InteractiveRandom() * max >> 16;
}

void InitPlayerRandoms()
{
	int i;
	for (i=0; i<MAX_PLAYERS; i++) {
		_player_seeds[i][0]=InteractiveRandom();
		_player_seeds[i][1]=InteractiveRandom();
	}
}

void SetDate(uint date)
{
	YearMonthDay ymd;
	ConvertDayToYMD(&ymd, _date = date);
	_cur_year = ymd.year;
	_cur_month = ymd.month;
#ifdef ENABLE_NETWORK
	_network_last_advertise_date = 0;
#endif /* ENABLE_NETWORK */
}


// multi os compatible sleep function

#ifdef __AMIGA__
// usleep() implementation
#	include <devices/timer.h>
#	include <dos/dos.h>

	extern struct Device      *TimerBase    = NULL;
	extern struct MsgPort     *TimerPort    = NULL;
	extern struct timerequest *TimerRequest = NULL;
#endif // __AMIGA__

void CSleep(int milliseconds)
{
	#if defined(WIN32)
		Sleep(milliseconds);
	#endif
	#if defined(UNIX)
		#if !defined(__BEOS__) && !defined(__AMIGA__)
			usleep(milliseconds * 1000);
		#endif
		#ifdef __BEOS__
			snooze(milliseconds * 1000);
		#endif
		#if defined(__AMIGA__)
		{
			ULONG signals;
			ULONG TimerSigBit = 1 << TimerPort->mp_SigBit;

			// send IORequest
			TimerRequest->tr_node.io_Command = TR_ADDREQUEST;
			TimerRequest->tr_time.tv_secs    = (milliseconds * 1000) / 1000000;
			TimerRequest->tr_time.tv_micro   = (milliseconds * 1000) % 1000000;
			SendIO((struct IORequest *)TimerRequest);

			if (!((signals = Wait(TimerSigBit | SIGBREAKF_CTRL_C)) & TimerSigBit) ) {
				AbortIO((struct IORequest *)TimerRequest);
			}
			WaitIO((struct IORequest *)TimerRequest);
		}
		#endif // __AMIGA__
	#endif
}

void InitializeClearLand();
void InitializeRail();
void InitializeRailGui();
void InitializeRoad();
void InitializeRoadGui();
void InitializeAirportGui();
void InitializeDock();
void InitializeDockGui();
void InitializeIndustries();
void InitializeLandscape();
void InitializeTowns();
void InitializeTrees();
void InitializeStations();
static void InitializeNameMgr();
void InitializePlayers();
static void InitializeCheats();

void GenerateLandscape();
void GenerateClearTile();

void GenerateIndustries();
void GenerateUnmovables();
void GenerateTowns();

void StartupPlayers();
void StartupEngines();
void StartupDisasters();
void GenerateTrees();

void ConvertGroundTilesIntoWaterTiles();

void InitializeGame()
{
	// Initialize the autoreplace array. Needs to be cleared between each game
	int i;
	for (i = 0; i < lengthof(_autoreplace_array); i++)
		_autoreplace_array[i] = i;

	AddTypeToEngines(); // make sure all engines have a type

	SetObjectToPlace(1, 0, 0, 0);

	_pause = 0;
	_fast_forward = 0;
	_tick_counter = 0;
	_date_fract = 0;
	_cur_tileloop_tile = 0;
	_vehicle_id_ctr_day = 0;

	{
		uint starting = ConvertIntDate(_patches.starting_date);
		if ( starting == (uint)-1) starting = 10958;
		SetDate(starting);
	}

	InitializeVehicles();
	_backup_orders_tile = 0;

	InitNewsItemStructs();
	InitializeLandscape();
	InitializeClearLand();
	InitializeRail();
	InitializeRailGui();
	InitializeRoad();
	InitializeRoadGui();
	InitializeAirportGui();
	InitializeDock();
	InitializeDockGui();
	InitializeTowns();
	InitializeTrees();
	InitializeStations();
	InitializeIndustries();

	InitializeNameMgr();
	InitializeVehiclesGuiList();
	InitializeTrains();

	InitializePlayers();
	InitializeCheats();

	InitTextEffects();
	InitTextMessage();
	InitializeAnimatedTiles();

	InitializeLandscapeVariables(false);

	ResetObjectToPlace();
}

void GenerateWorld(int mode)
{
	int i;

	// Make sure everything is done via OWNER_NONE
	_current_player = OWNER_NONE;

	_generating_world = true;
	InitializeGame();
	SetObjectToPlace(1, 0, 0, 0);

	// Must start economy early because of the costs.
	StartupEconomy();

	// Don't generate landscape items when in the scenario editor.
	if (mode == 1) {
		// empty world in scenario editor
		ConvertGroundTilesIntoWaterTiles();
	} else {
		GenerateLandscape();
		GenerateClearTile();

		// only generate towns, tree and industries in newgame mode.
		if (mode == 0) {
			GenerateTowns();
			GenerateTrees();
			GenerateIndustries();
			GenerateUnmovables();
		}
	}

	// These are probably pointless when inside the scenario editor.
	StartupPlayers();
	StartupEngines();
	StartupDisasters();
	_generating_world = false;

	// No need to run the tile loop in the scenario editor.
	if (mode != 1) {
		for(i=0x500; i!=0; i--)
			RunTileLoop();
	}

	ResetObjectToPlace();
}

void DeleteName(StringID id)
{
	if ((id & 0xF800) == 0x7800) {
		memset(_name_array[id & 0x1FF], 0, sizeof(_name_array[id & 0x1FF]));
	}
}

byte *GetName(int id, byte *buff)
{
	byte *b;

	if (id & 0x600) {
		if (id & 0x200) {
			if (id & 0x400) {
				GetParamInt32();
				GetParamUint16();
			} else {
				GetParamUint16();
			}
		} else {
			GetParamInt32();
		}
	}

	b = _name_array[(id&~0x600)];
	while ((*buff++ = *b++) != 0);

	return buff - 1;
}


static void InitializeCheats()
{
	memset(&_cheats, 0, sizeof(Cheats));
}


static void InitializeNameMgr()
{
	memset(_name_array, 0, sizeof(_name_array));
}

StringID RealAllocateName(const byte *name, byte skip, bool check_double)
{
	int free_item = -1;
	const byte *names;
	byte *dst;
	int i;

	names = &_name_array[0][0];

	for(i=0; i!=512; i++,names+=sizeof(_name_array[0])) {
		if (names[0] == 0) {
			if (free_item == -1)
				free_item = i;
		} else {
			if (check_double && str_eq(names, name)) {
				_error_message = STR_0132_CHOSEN_NAME_IN_USE_ALREADY;
				return 0;
			}
		}
	}

	if (free_item < 0) {
		_error_message = STR_0131_TOO_MANY_NAMES_DEFINED;
		return 0;
	}

	dst=_name_array[free_item];

	for(i=0; (dst[i] = name[i]) != 0 && ++i != 32; ) {}
	dst[31] = 0;

	return free_item | 0x7800 | (skip << 8);
}


#define M(a,b) ((a<<5)|b)
static const uint16 _month_date_from_year_day[] = {
M(0,1),M(0,2),M(0,3),M(0,4),M(0,5),M(0,6),M(0,7),M(0,8),M(0,9),M(0,10),M(0,11),M(0,12),M(0,13),M(0,14),M(0,15),M(0,16),M(0,17),M(0,18),M(0,19),M(0,20),M(0,21),M(0,22),M(0,23),M(0,24),M(0,25),M(0,26),M(0,27),M(0,28),M(0,29),M(0,30),M(0,31),
M(1,1),M(1,2),M(1,3),M(1,4),M(1,5),M(1,6),M(1,7),M(1,8),M(1,9),M(1,10),M(1,11),M(1,12),M(1,13),M(1,14),M(1,15),M(1,16),M(1,17),M(1,18),M(1,19),M(1,20),M(1,21),M(1,22),M(1,23),M(1,24),M(1,25),M(1,26),M(1,27),M(1,28),M(1,29),
M(2,1),M(2,2),M(2,3),M(2,4),M(2,5),M(2,6),M(2,7),M(2,8),M(2,9),M(2,10),M(2,11),M(2,12),M(2,13),M(2,14),M(2,15),M(2,16),M(2,17),M(2,18),M(2,19),M(2,20),M(2,21),M(2,22),M(2,23),M(2,24),M(2,25),M(2,26),M(2,27),M(2,28),M(2,29),M(2,30),M(2,31),
M(3,1),M(3,2),M(3,3),M(3,4),M(3,5),M(3,6),M(3,7),M(3,8),M(3,9),M(3,10),M(3,11),M(3,12),M(3,13),M(3,14),M(3,15),M(3,16),M(3,17),M(3,18),M(3,19),M(3,20),M(3,21),M(3,22),M(3,23),M(3,24),M(3,25),M(3,26),M(3,27),M(3,28),M(3,29),M(3,30),
M(4,1),M(4,2),M(4,3),M(4,4),M(4,5),M(4,6),M(4,7),M(4,8),M(4,9),M(4,10),M(4,11),M(4,12),M(4,13),M(4,14),M(4,15),M(4,16),M(4,17),M(4,18),M(4,19),M(4,20),M(4,21),M(4,22),M(4,23),M(4,24),M(4,25),M(4,26),M(4,27),M(4,28),M(4,29),M(4,30),M(4,31),
M(5,1),M(5,2),M(5,3),M(5,4),M(5,5),M(5,6),M(5,7),M(5,8),M(5,9),M(5,10),M(5,11),M(5,12),M(5,13),M(5,14),M(5,15),M(5,16),M(5,17),M(5,18),M(5,19),M(5,20),M(5,21),M(5,22),M(5,23),M(5,24),M(5,25),M(5,26),M(5,27),M(5,28),M(5,29),M(5,30),
M(6,1),M(6,2),M(6,3),M(6,4),M(6,5),M(6,6),M(6,7),M(6,8),M(6,9),M(6,10),M(6,11),M(6,12),M(6,13),M(6,14),M(6,15),M(6,16),M(6,17),M(6,18),M(6,19),M(6,20),M(6,21),M(6,22),M(6,23),M(6,24),M(6,25),M(6,26),M(6,27),M(6,28),M(6,29),M(6,30),M(6,31),
M(7,1),M(7,2),M(7,3),M(7,4),M(7,5),M(7,6),M(7,7),M(7,8),M(7,9),M(7,10),M(7,11),M(7,12),M(7,13),M(7,14),M(7,15),M(7,16),M(7,17),M(7,18),M(7,19),M(7,20),M(7,21),M(7,22),M(7,23),M(7,24),M(7,25),M(7,26),M(7,27),M(7,28),M(7,29),M(7,30),M(7,31),
M(8,1),M(8,2),M(8,3),M(8,4),M(8,5),M(8,6),M(8,7),M(8,8),M(8,9),M(8,10),M(8,11),M(8,12),M(8,13),M(8,14),M(8,15),M(8,16),M(8,17),M(8,18),M(8,19),M(8,20),M(8,21),M(8,22),M(8,23),M(8,24),M(8,25),M(8,26),M(8,27),M(8,28),M(8,29),M(8,30),
M(9,1),M(9,2),M(9,3),M(9,4),M(9,5),M(9,6),M(9,7),M(9,8),M(9,9),M(9,10),M(9,11),M(9,12),M(9,13),M(9,14),M(9,15),M(9,16),M(9,17),M(9,18),M(9,19),M(9,20),M(9,21),M(9,22),M(9,23),M(9,24),M(9,25),M(9,26),M(9,27),M(9,28),M(9,29),M(9,30),M(9,31),
M(10,1),M(10,2),M(10,3),M(10,4),M(10,5),M(10,6),M(10,7),M(10,8),M(10,9),M(10,10),M(10,11),M(10,12),M(10,13),M(10,14),M(10,15),M(10,16),M(10,17),M(10,18),M(10,19),M(10,20),M(10,21),M(10,22),M(10,23),M(10,24),M(10,25),M(10,26),M(10,27),M(10,28),M(10,29),M(10,30),
M(11,1),M(11,2),M(11,3),M(11,4),M(11,5),M(11,6),M(11,7),M(11,8),M(11,9),M(11,10),M(11,11),M(11,12),M(11,13),M(11,14),M(11,15),M(11,16),M(11,17),M(11,18),M(11,19),M(11,20),M(11,21),M(11,22),M(11,23),M(11,24),M(11,25),M(11,26),M(11,27),M(11,28),M(11,29),M(11,30),M(11,31),
};
#undef M

enum {
	ACCUM_JAN = 0,
	ACCUM_FEB = ACCUM_JAN + 31,
	ACCUM_MAR = ACCUM_FEB + 29,
	ACCUM_APR = ACCUM_MAR + 31,
	ACCUM_MAY = ACCUM_APR + 30,
	ACCUM_JUN = ACCUM_MAY + 31,
	ACCUM_JUL = ACCUM_JUN + 30,
	ACCUM_AUG = ACCUM_JUL + 31,
	ACCUM_SEP = ACCUM_AUG + 31,
	ACCUM_OCT = ACCUM_SEP + 30,
	ACCUM_NOV = ACCUM_OCT + 31,
	ACCUM_DEC = ACCUM_NOV + 30,
};

static const uint16 _accum_days_for_month[] = {
	ACCUM_JAN,ACCUM_FEB,ACCUM_MAR,ACCUM_APR,
	ACCUM_MAY,ACCUM_JUN,ACCUM_JUL,ACCUM_AUG,
	ACCUM_SEP,ACCUM_OCT,ACCUM_NOV,ACCUM_DEC,
};


void ConvertDayToYMD(YearMonthDay *ymd, uint16 date)
{
	uint yr = date / (365+365+365+366);
	uint rem = date % (365+365+365+366);
	uint x;

	yr *= 4;

	if (rem >= 366) {
		rem--;
		do {
			rem -= 365;
			yr++;
		} while (rem >= 365);
		if (rem >= 31+28) rem++;
	}

	ymd->year = yr;

	x = _month_date_from_year_day[rem];
	ymd->month = x >> 5;
	ymd->day = x & 0x1F;
}

// year is a number between 0..?
// month is a number between 0..11
// day is a number between 1..31
uint ConvertYMDToDay(uint year, uint month, uint day)
{
	uint rem;

	// day in the year
	rem = _accum_days_for_month[month] + day - 1;

	// remove feb 29 from year 1,2,3
	if (year & 3) rem += (year & 3) * 365 + (rem < 31+29);

	// base date.
	return (year >> 2) * (365+365+365+366) + rem;
}

// convert a date on the form
// 1920 - 2090
// 192001 - 209012
// 19200101 - 20901231
// or if > 2090 and below 65536, treat it as a daycount
// returns -1 if no conversion was possible
uint ConvertIntDate(uint date)
{
	uint year, month = 0, day = 1;

	if (IS_INT_INSIDE(date, 1920, 2090 + 1)) {
		year = date - 1920;
	} else if (IS_INT_INSIDE(date, 192001, 209012+1)) {
		month = date % 100 - 1;
		year = date / 100 - 1920;
	} else if (IS_INT_INSIDE(date, 19200101, 20901231+1)) {
		day = date % 100; date /= 100;
		month = date % 100 - 1;
		year = date / 100 - 1920;
	} else if (IS_INT_INSIDE(date, 2091, 65536))
		return date;
	else
		return (uint)-1;

	// invalid ranges?
	if (month >= 12 || !IS_INT_INSIDE(day, 1, 31+1)) return (uint)-1;

	return ConvertYMDToDay(year, month, day);
}

typedef struct LandscapePredefVar {
	StringID names[NUM_CARGO];
	byte weights[NUM_CARGO];
	StringID sprites[NUM_CARGO];

	uint16 initial_cargo_payment[NUM_CARGO];
	byte transit_days_table_1[NUM_CARGO];
	byte transit_days_table_2[NUM_CARGO];

	byte railwagon_by_cargo[3][NUM_CARGO];

	byte road_veh_by_cargo_start[NUM_CARGO];
	byte road_veh_by_cargo_count[NUM_CARGO];
} LandscapePredefVar;

#include "table/landscape_const.h"


// Calculate constants that depend on the landscape type.
void InitializeLandscapeVariables(bool only_constants)
{
	const LandscapePredefVar *lpd;
	int i;
	StringID str;

	lpd = &_landscape_predef_var[_opt.landscape];

	memcpy(_cargoc.ai_railwagon, lpd->railwagon_by_cargo, sizeof(lpd->railwagon_by_cargo));
	memcpy(_cargoc.ai_roadveh_start, lpd->road_veh_by_cargo_start,sizeof(lpd->road_veh_by_cargo_start));
	memcpy(_cargoc.ai_roadveh_count, lpd->road_veh_by_cargo_count,sizeof(lpd->road_veh_by_cargo_count));

	for(i=0; i!=NUM_CARGO; i++) {
		_cargoc.sprites[i] = lpd->sprites[i];

		str = lpd->names[i];
		_cargoc.names_s[i] = str;
		_cargoc.names_p[i] = (str += 0x20);
		_cargoc.names_long_s[i] = (str += 0x20);
		_cargoc.names_long_p[i] = (str += 0x20);
		_cargoc.names_short[i] = (str += 0x20);
		_cargoc.weights[i] = lpd->weights[i];

		if (!only_constants) {
			_cargo_payment_rates[i] = lpd->initial_cargo_payment[i];
			_cargo_payment_rates_frac[i] = 0;
		}

		_cargoc.transit_days_1[i] = lpd->transit_days_table_1[i];
		_cargoc.transit_days_2[i] = lpd->transit_days_table_2[i];
	}
}

// distance in Manhattan metric
uint GetTileDist(TileIndex xy1, TileIndex xy2)
{
	return myabs(TileX(xy1) - TileX(xy2)) +
				myabs(TileY(xy1) - TileY(xy2));
}

// maximum distance in x _or_ y
uint GetTileDist1D(TileIndex xy1, TileIndex xy2)
{
	return max(myabs(TileX(xy1) - TileX(xy2)),
						 myabs(TileY(xy1) - TileY(xy2)));
}

uint GetTileDist1Db(TileIndex xy1, TileIndex xy2)
{
	int a = myabs(TileX(xy1) - TileX(xy2));
	int b = myabs(TileY(xy1) - TileY(xy2));

	if (a > b)
		return a*2+b;
	else
		return b*2+a;
}

uint GetTileDistAdv(TileIndex xy1, TileIndex xy2)
{
	uint a = myabs(TileX(xy1) - TileX(xy2));
	uint b = myabs(TileY(xy1) - TileY(xy2));
	return a*a+b*b;
}

bool CheckDistanceFromEdge(TileIndex tile, uint distance)
{
	return IS_INT_INSIDE(TileX(tile), distance, MapSizeX() - distance) &&
			IS_INT_INSIDE(TileY(tile), distance, MapSizeY() - distance);
}

void OnNewDay_Train(Vehicle *v);
void OnNewDay_RoadVeh(Vehicle *v);
void OnNewDay_Aircraft(Vehicle *v);
void OnNewDay_Ship(Vehicle *v);
void OnNewDay_EffectVehicle(Vehicle *v) { /* empty */ }
void OnNewDay_DisasterVehicle(Vehicle *v);

typedef void OnNewVehicleDayProc(Vehicle *v);

static OnNewVehicleDayProc * _on_new_vehicle_day_proc[] = {
	OnNewDay_Train,
	OnNewDay_RoadVeh,
	OnNewDay_Ship,
	OnNewDay_Aircraft,
	OnNewDay_EffectVehicle,
	OnNewDay_DisasterVehicle,
};

void EnginesDailyLoop();
void DisasterDailyLoop();
void PlayersMonthlyLoop();
void EnginesMonthlyLoop();
void TownsMonthlyLoop();
void IndustryMonthlyLoop();
void StationMonthlyLoop();

void PlayersYearlyLoop();
void TrainsYearlyLoop();
void RoadVehiclesYearlyLoop();
void AircraftYearlyLoop();
void ShipsYearlyLoop();

void WaypointsDailyLoop();


static const uint16 _autosave_months[] = {
	0, // never
	0xFFF, // every month
	0x249, // every 3 months
	0x041, // every 6 months
	0x001, // every 12 months
};

void IncreaseDate()
{
	const int vehicles_per_day = (1 << (sizeof(_date_fract) * 8)) / 885;
	int i,ctr,t;
	YearMonthDay ymd;

	if (_game_mode == GM_MENU) {
		_tick_counter++;
		return;
	}

	/*if the day changed, call the vehicle event but only update a part of the vehicles
		old max was i!= 12. But with that and a bigger number of vehicles (2560), per day only
		a part of it could be done, namely: function called max_size date_fract (uint16) / 885 x 12 ==>
		65536 / 885 = 74; 74x12 = 888. So max 888. Any vehicles above that were not _on_new_vehicle_day_proc'd
		eg. aged.
		So new code updates it for max vehicles.
		(_vehicles_size / maximum number of times ctr is incremented before reset ) + 1 (to get last vehicles too)
		max size of _date_fract / 885 (added each tick) is number of times before ctr is reset.
		Calculation might look complicated, but compiler just replaces it with 35, so that's ok
	*/

	ctr = _vehicle_id_ctr_day;
	for (i = 0; i != (_vehicles_size / vehicles_per_day) + 1 && ctr != _vehicles_size; i++) {
		Vehicle *v = GetVehicle(ctr++);
		if ((t = v->type) != 0)
			_on_new_vehicle_day_proc[t - 0x10](v);
	}
	_vehicle_id_ctr_day = ctr;

	/* increase day, and check if a new day is there? */
	_tick_counter++;

	_date_fract += 885;
	if (_date_fract >= 885)
		return;

	/* yeah, increse day counter and call various daily loops */
	_date++;

	_vehicle_id_ctr_day = 0;

	TextMessageDailyLoop();

	DisasterDailyLoop();
	WaypointsDailyLoop();

	if (_game_mode != GM_MENU) {
		InvalidateWindowWidget(WC_STATUS_BAR, 0, 0);
		EnginesDailyLoop();
	}

	/* check if we entered a new month? */
	ConvertDayToYMD(&ymd, _date);
	if ((byte)ymd.month == _cur_month)
		return;
	_cur_month = ymd.month;

	/* yes, call various monthly loops */
	if (_game_mode != GM_MENU) {
		if (HASBIT(_autosave_months[_opt.autosave], _cur_month)) {
			_do_autosave = true;
			RedrawAutosave();
		}

		PlayersMonthlyLoop();
		EnginesMonthlyLoop();
		TownsMonthlyLoop();
		IndustryMonthlyLoop();
		StationMonthlyLoop();
#ifdef ENABLE_NETWORK
		if (_network_server)
			NetworkServerMonthlyLoop();
#endif /* ENABLE_NETWORK */
	}

	/* check if we entered a new year? */
	if ((byte)ymd.year == _cur_year)
		return;
	_cur_year = ymd.year;

	/* yes, call various yearly loops */

	PlayersYearlyLoop();
	TrainsYearlyLoop();
	RoadVehiclesYearlyLoop();
	AircraftYearlyLoop();
	ShipsYearlyLoop();
#ifdef ENABLE_NETWORK
	if (_network_server)
		NetworkServerYearlyLoop();
#endif /* ENABLE_NETWORK */

	/* check if we reached 2090, that's the maximum year. */
	if (_cur_year == 171) {
		Vehicle *v;
		_cur_year = 170;
		_date = 62093;
		FOR_ALL_VEHICLES(v) {
			v->date_of_last_service -= 365; // 1 year is 365 days long
		}
	}

	if (_patches.auto_euro)
		CheckSwitchToEuro();

	/* XXX: check if year 2050 was reached */
}

int FindFirstBit(uint32 value)
{
	// This is much faster than the one that was before here.
	//  Created by Darkvater.. blame him if it is wrong ;)
	// Btw, the macro FINDFIRSTBIT is better to use when your value is
	//  not more than 128.
	byte i = 0;
	if (value & 0xffff0000) { value >>= 16; i += 16; }
	if (value & 0x0000ff00) { value >>= 8;  i += 8; }
	if (value & 0x000000f0) { value >>= 4;  i += 4; }
	if (value & 0x0000000c) { value >>= 2;  i += 2; }
	if (value & 0x00000002) { i += 1; }
	return i;
}


extern uint SafeTileAdd(uint tile, int add, const char *exp, const char *file, int line)
{
	uint x = TileX(tile) + (signed char)(add & 0xFF);
	uint y = TileY(tile) + ((((0x8080 + add)>>8) & 0xFF) - 0x80);

	if (x >= MapSizeX() || y >= MapSizeY()) {
		char buf[512];

		sprintf(buf, "TILE_ADD(%s) when adding 0x%.4X and %d failed", exp, tile, add);
#if !defined(_DEBUG) || !defined(_MSC_VER)
		fprintf(stderr, "%s:%d %s\n", file, line, buf);
#else
		_assert(buf, (char*)file, line);
#endif
	}

	assert(TILE_XY(x,y) == TILE_MASK(tile + add));

	return TILE_XY(x,y);
}

static void Save_NAME()
{
	int i;
	byte *b = _name_array[0];

	for(i=0; i!=lengthof(_name_array); i++,b+=sizeof(_name_array[0])) {
		if (*b) {
			SlSetArrayIndex(i);
			SlArray(b, strlen(b), SLE_UINT8);
		}
	}
}

static void Load_NAME()
{
	int index;

	while ((index = SlIterateArray()) != -1) {
		SlArray(_name_array[index],SlGetFieldLength(),SLE_UINT8);
	}
}

static const byte _game_opt_desc[] = {
	// added a new difficulty option (town attitude) in version 4
	SLE_CONDARR(GameOptions,diff,						SLE_FILE_I16 | SLE_VAR_I32, 17, 0, 3),
	SLE_CONDARR(GameOptions,diff,						SLE_FILE_I16 | SLE_VAR_I32, 18, 4, 255),
	SLE_VAR(GameOptions,diff_level,			SLE_UINT8),
	SLE_VAR(GameOptions,currency,				SLE_UINT8),
	SLE_VAR(GameOptions,kilometers,			SLE_UINT8),
	SLE_VAR(GameOptions,town_name,			SLE_UINT8),
	SLE_VAR(GameOptions,landscape,			SLE_UINT8),
	SLE_VAR(GameOptions,snow_line,			SLE_UINT8),
	SLE_VAR(GameOptions,autosave,				SLE_UINT8),
	SLE_VAR(GameOptions,road_side,			SLE_UINT8),
	SLE_END()
};

// Save load game options
static void SaveLoad_OPTS()
{
	SlObject(&_opt, _game_opt_desc);
}


static const SaveLoadGlobVarList _date_desc[] = {
	{&_date, 										SLE_UINT16, 0, 255},
	{&_date_fract, 							SLE_UINT16, 0, 255},
	{&_tick_counter, 						SLE_UINT16, 0, 255},
	{&_vehicle_id_ctr_day, 			SLE_UINT16, 0, 255},
	{&_age_cargo_skip_counter, 	SLE_UINT8,	0, 255},
	{&_avail_aircraft, 					SLE_UINT8,	0, 255},
	{&_cur_tileloop_tile, 			SLE_UINT16, 0, 255},
	{&_disaster_delay, 					SLE_UINT16, 0, 255},
	{&_station_tick_ctr, 				SLE_UINT16, 0, 255},
	{&_random_seeds[0][0], 					SLE_UINT32, 0, 255},
	{&_random_seeds[0][1], 					SLE_UINT32, 0, 255},
	{&_cur_town_ctr, 						SLE_UINT8,	0, 255},
	{&_cur_player_tick_index, 	SLE_FILE_U8 | SLE_VAR_UINT, 0, 255},
	{&_next_competitor_start, 	SLE_FILE_U16 | SLE_VAR_UINT, 0, 255},
	{&_trees_tick_ctr, 					SLE_UINT8,	0, 255},
	{&_pause, 									SLE_UINT8,	4, 255},
	{NULL,											0,					0,   0}
};

// Save load date related variables as well as persistent tick counters
// XXX: currently some unrelated stuff is just put here
static void SaveLoad_DATE()
{
	SlGlobList(_date_desc);
}


static const SaveLoadGlobVarList _view_desc[] = {
	{&_saved_scrollpos_x,			SLE_FILE_I16 | SLE_VAR_INT, 0, 255},
	{&_saved_scrollpos_y,			SLE_FILE_I16 | SLE_VAR_INT, 0, 255},
	{&_saved_scrollpos_zoom,	SLE_UINT8,	0, 255},
	{NULL,										0,					0,   0}
};

static void SaveLoad_VIEW()
{
	SlGlobList(_view_desc);
}

static void SaveLoad_MAPT() {
  SlArray(_map_type_and_height, MapSize(), SLE_UINT8);
}

static void SaveLoad_MAP2() {
	if (_sl.version < 5) {
		/* In those versions the _map2 was 8 bits */
		SlArray(_map2, MapSize(), SLE_FILE_U8 | SLE_VAR_U16);
	} else {
		SlArray(_map2, MapSize(), SLE_UINT16);
	}
}

static void SaveLoad_M3LO() {
  SlArray(_map3_lo, MapSize(), SLE_UINT8);
}

static void SaveLoad_M3HI() {
  SlArray(_map3_hi, MapSize(), SLE_UINT8);
}

static void SaveLoad_MAPO() {
  SlArray(_map_owner, MapSize(), SLE_UINT8);
}

static void SaveLoad_MAP5() {
  SlArray(_map5, MapSize(), SLE_UINT8);
}

static void SaveLoad_MAPE() {
  SlArray(_map_extra_bits, MapSize() / 4, SLE_UINT8);
}


static void Save_CHTS()
{
	byte count = sizeof(_cheats)/sizeof(Cheat);
	Cheat* cht = (Cheat*) &_cheats;
	Cheat* cht_last = &cht[count];

	SlSetLength(count*2);
	for(; cht != cht_last; cht++) {
		SlWriteByte(cht->been_used);
		SlWriteByte(cht->value);
	}
}

static void Load_CHTS()
{
	Cheat* cht = (Cheat*) &_cheats;

	uint count = SlGetFieldLength()/2;
	for(; count; count--, cht++)
	{
		cht->been_used = (byte)SlReadByte();
		cht->value = (byte)SlReadByte();
	}
}


const ChunkHandler _misc_chunk_handlers[] = {
	{ 'MAPT', SaveLoad_MAPT, SaveLoad_MAPT, CH_RIFF },
	{ 'MAP2', SaveLoad_MAP2, SaveLoad_MAP2, CH_RIFF },
	{ 'M3LO', SaveLoad_M3LO, SaveLoad_M3LO, CH_RIFF },
	{ 'M3HI', SaveLoad_M3HI, SaveLoad_M3HI, CH_RIFF },
	{ 'MAPO', SaveLoad_MAPO, SaveLoad_MAPO, CH_RIFF },
	{ 'MAP5', SaveLoad_MAP5, SaveLoad_MAP5, CH_RIFF },
	{ 'MAPE', SaveLoad_MAPE, SaveLoad_MAPE, CH_RIFF },

	{ 'NAME', Save_NAME, Load_NAME, CH_ARRAY},
	{ 'DATE', SaveLoad_DATE, SaveLoad_DATE, CH_RIFF},
	{ 'VIEW', SaveLoad_VIEW, SaveLoad_VIEW, CH_RIFF},
	{ 'OPTS', SaveLoad_OPTS, SaveLoad_OPTS, CH_RIFF},
	{ 'CHTS', Save_CHTS, Load_CHTS, CH_RIFF | CH_LAST}
};